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Further studies on cellulose III polymorphs. Transformations to cellulose IV lattices and subsequent reactions
Author(s) -
Chidambareswaran P. K.,
Sreenivasan S.,
Patil N. B.,
Lokhande H. T.
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070270233
Subject(s) - cellulose , crystallinity , hydrolysis , crystal structure , chemistry , acid hydrolysis , infrared spectroscopy , fourier transform infrared spectroscopy , crystallography , boiling , polymer chemistry , nuclear chemistry , materials science , organic chemistry , chemical engineering , engineering
Production of cellulose IV polymorphs, their characterization using X‐ray diffraction and infrared spectroscopy, as well as the effect of chemical treatments on these polymorphs have been investigated. Cellulose III I and III II polymorphs, produced from celluloses I and II using EDA—MeOH treatments, were of particular interest as starting materials in the study. Celluloses IV I and IV II gave identical equatorial X‐ray patterns in the absence of other crystal lattices in the samples. Crystallinity as well as conformation were indicated to influence production and further reactions of the samples. The latter included boiling in water, acid hydrolysis, and treatments with EDA—water, EDA—MeOH, and NaOH solutions. Cellulose IV I → I, IV I → I → II, and cellulose IV II → II lattice conversions were demonstrated to occur with EDA—water treatments, thereby providing a new technique for observing these transformations. Conformational differences were apparent among celluloses I, II, III I , and III II , each produced using different experimental procedures.